I expect the Led Zeppelin to be flying high for some time. They and the Jeff Beck Group are to rock what Formula One cars are to road racing. Their raw power is compelling and hypnotic while their complexity makes repeated exposure a pleasure. The L.Z. vary the arrangements of the same song on successive nights quite widely. As Jimmy Page who has little sympathy with complicated studio effects said to me: “If we can’t do it live, we won’t do it.” That idea hits me just right, as does the entire Led Zeppelin from stem to stern.

What Should Never Be On this Saturday afternoon, the legions of the School of Rock (Boston branch) were pretty much indistinguishable from the real Led Zeppelin, who were themselves teenagers when they formed in the late ’60s.